| 摘要 |
A refrigeration system employing ambient air defrost and a method of operating such a system. The refrigeration system includes a cabinet having an opening in one of its walls, for enabling access to products in the interior of the cabinet. Extending along the walls of the cabinet are an inner, primary air conduit and an outer, secondary air conduit. The primary air conduit contains a plurality of fans for circulating the air along the conduit and a mechanism for refrigerating air passing through the conduit during a refrigeration cycle. The air circulated through the primary conduit forms a closed primary air band. A plurality of second fans are arranged within the secondary air conduit and during a refrigeration cycle circulate air through the conduit, thereby establishing a closed secondary air band during the refrigeration cycle. When the system is to be defrosted, the refrigeration mechanism is deactivated so that the air passing along the primary air conduit is not refrigerated. In addition, the secondary fans in the secondary air conduit are turned off and the primary fans in the primary conduit are operated so as to cause a greater quantity of air to pass along the primary air conduit. During the defrost mode of operation, the primary air fans tend to draw in ambient air from outside of the cabinet thereby providing warmer air for circulation through the primary air conduit which serves to defrost the refrigeration mechanism.
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